Buffer overflow in Gpac
CVE-2026-108538
A security vulnerability has been detected in GPAC up to 26.07.0. The impacted element is the function gf_mx_v of the file utils/os_thread.c of the component MP4Box. Such manipulation leads to use after free. The attack can be launched remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Gpac — versions 26.07
Weakness classification (CWE)
References
- vuldb.com/vuln/416193 (technical-description, vdb-entry)
- vuldb.com/vuln/416193/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-108538 (third-party-advisory)
- vuldb.com/submit/941979 (third-party-advisory)
- github.com/user-attachments/files/31270809/PoC.zip (exploit)
Frequently asked questions
- What is CVE-2026-108538?
- CVE-2026-108538 is a medium-severity vulnerability in Gpac, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 6.3/10. Published 2026-10-11.
- How severe is CVE-2026-108538?
- Medium severity. CVSS v3 base score is 6.3 out of 10.